Weather: cool enough, about 72 degrees.
Pretty successful. At mile 2.4, at the top of the hill, the Gump dogs were out. I did glance at my watch, because I had to slow to a walk-about a 17.40 pace, for about 40 seconds. The Gump dogs consist of two 70 lb Shepherd-Collie mix, and two beagle mix dogs. They've always been relatively friendly to me, but they do tend to accost me head on, and I always slow to a walk around them. So I would guess I lost twenty seconds or so to them.
End result: 1 hour 12 minutes. Not bad when I just applied the "running harder" principle.